A130712 - OEIS

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A130712

Number of ways of placing non-attacking knights on an n X n chessboard symmetric about the diagonal and under 90-degree rotation.

0

1, 2, 2, 6, 3, 21, 12, 118, 56, 959, 333, 9892, 3038, 154506, 38869, 3291314, 689349, 103050492, 17202265, 4328976863, 615532072, 271539093065, 30694296121, 22908330863086, 2181826599454, 2875160955130336, 217661432837240

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..26.

CROSSREFS

Sequence in context: A305814 A266479 A296147 * A276075 A321908 A130728

Adjacent sequences: A130709 A130710 A130711 * A130713 A130714 A130715

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 25 2008

STATUS

approved